For what it is worth, I just sent a request to ESPN Feedback through this website
https://r.espn.go.com/members/contact/index and got this response:
Hello,
Thank you for contacting us.
I'm sorry, ESPN3.com is not available on iPad, iPhone, or other mobile devices at this time. We do hope to support this option in the future.
For live assistance with this or any other issue, please call Customer Care at 1-888-549-3776 (ESPN) between 8:00 a.m. and 1:00 a.m. EST.
Regards,
Candice
ESPN.com Customer Care
This looks like at least they are working on it. If you want, click the link and give them your 2 cents worth as well.